Since its launch in April 2007. the United States Natural Gas Fund (UNG) has endured a strange existence. After enjoying moderate success during its first 18 months–assets stood at more than $700 million at the end of 2008, UNG exploded as the natural gas craze hit and investors lined up for access to the “fuel [...] Related Stories: January ETF Data: Industry Springs A Leak March ETF Data: Back In The Black UNG In Freefall: New Driver, Same Result